Oil in radiator from motor on 2001 Dodge Neon

I replaced the head gasket and then ran the car for ten minutes 3 quarts of oil leaked into the head.I know i put the head gasket on the right way and torque it properly ,also the head was pressured checked at a machine shop,the motor runs good so im figuring that i installed the head gasket properly what could cause the oil to go into radiator so quickly?I dont think it had this problem before i replaced the head gasket but the car wasnt running long after it first overheated ,or so i was told,i figured if the head wasnt seated properly it wouldnt run good.How could i test this? Thanks

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